Printing-telegraph alphabet.



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DAVID S.` HULFISI-I, `OI? TORONTO, ONTARIO, CANADA, ASSIGNOR, BY MESNE ASSIGN- `lVilN'JlS, TO GENERAL ENGINEERING `AND' CONSTRUCTION COMPANY, LIMITED, 0F TORONTO, CANADA, A.`CORIE'OR'tlIIClN` 0F Ol\l".|.ARIO.`

l PRINTING-TELEGRAPH ALPHABET.

. Specification of Letters` Patent.

Patented N 0V. 24, 1914.

Application filed April 20, 1911, Serial N0. 622,177. Renewed April 9, 1914. `Serial No. 830,797.

Y T0 all whom it may concern:

i Be it known that I DAVID S. l-IULFISH, a citizen of the United tates of America, and a` resident of Toronto, county ofk York, Province of Ontario,`and Dominion of Canada, have invented a new and useful Improvement in Printing-Telegraph Alphabets, of which the following is a specification.

Myinventionrelates to an English alphabet, the characters of `which are built up from predetermined combinations of impresslons from four elemental component types,

the impressions being potentially periodically recurrent considered lineally along the line of writing.`

`tions approaching the limits of commercial practieability. A resort to the use of alternatmg current imposes `as a requlrement for hlgh speed transmission that a maximum number of thealternationsin a current of a definite frequency shall be utilizedto imprint predetermined types in order that the maximum imprinting possibilities ofa current of a definite frequency may be realized. It is with a view toward providing a directly readable English alphabet the characters of which are imprinted from impressions of component types available for selec- `tion only in cyclic order, that my invention is directed. I accomplish this and other desirable features by utilizing a design of character that is built up from a number of predetermined impressions `from component type faces, the predetermined impressions being selected from a potentially eriodically recurrent series of impressions rom all of the four component types.

In the fi res which accompany and form a part of t is specication and in whichlike numerals designate corresponding parts throughout; Figure 1 is a plan `view of the four component type faces arranged 1n the Fig. 2 as to illustrate form of a printing telegraph printiner symbol. Fig. 2 1s a View of a record of the impressions of all of the type faces such as would result from utilizing all of the alternations of an` alternating current for imprinting purposes. Fig. `3 is a view ofmy improved alphabet together with the numerals from 0 to 9 so spaced with regardto sign.

` As there are numerous methods known in the printing telegraph art for selectively operating types having faces as shown in Fig.

the principle of its d`e= l, it is not deemed necessary in this disclosure to illustrate any definite arrangement of apparatus or clrcuits for their operation.

Assuming therefore, that the type faces as shown in Fig. `l are maintained in such relation to al recording surface that each may record an impression thereon, that the recording surface be moved under the type as viewed in Fig. l fromright to `left at a speedwhich is commensurate `with the alternations of the alternating currents used, and that the distance between any two maximum currentvalues is further commensurate with the spacing between the types as indicated by the perpendicular lines in Fig. 1,

andassuming further that type face 4 is operated by a positive potential, then from the foregoing it follows that type face 3 is operated by thenext succeeding negative impulse, type face `2 is operated' by the next succeeding positive impulse while type face l is operated by the next succeeding negative impulse. ."lherefore,` if an alternating current of a predetermined frequeneybe placed through the controlling magnets of the pens 4, 3, 2, l, they will be imprinted in cyclic distribution on the receiving tape and the resultant record will be a continuous lattice as shown in Fig. 2. `lf now a transmitting tape be perforated with a predetermined spacing of perforations, it will be noted that it will be possible to select from the operating' alternating current, impulses of predetermined potential to operate predetermined type faces to imprint their impressions in proper relation to previous imprints, in the course of their potential recurrence.

The letter A is built upy and recorded by the use of an alternating current as follows: The first positive current maximum Y, from negative maximum to positive maximum and pen face 2 is imprinted With its medianpoint over the median point of the previous imprint of pen face 4; the record tape again moves one tape interval While the current changes from positive maximum to negative maximum, placing pen face l in a potential condition of operation but its imprint is omitted as before stated through the predetermined spacing of the perfora- V` tionsiii the transmitting tape; the record tape again moves one tape interval While the current changes from negative maximumto positive maximum and pen face 4 is again imprinted a distance away from the previous imprint of pen face 4 of four tape intervals or the Width of a complete normal character such as AJH the tape again moves one tape interval While the current changes again in value from positive maximum to negative maximum placing pen face 3 again in a potential condition of operation; the record tape now moves another tape interval While the current changes from negative maximum` to positive maximum at which time pen facev 2 is again imprinted With one of its extremities abutting yone of the extremities of the previous imprint of pen face 2 and its median point over the median point of the last imprint of pen face 4; the record tape moves again one tape interval While the current changes from positive maximum to negative maximum at Which time pen face l is imprinted with its vertical leg registering with the upper half of the first imprint of pen face 4 and With the extremity of its horizontal leg abutting the l last imprint of pen face 4 to form the letter A Thus anyof the letters ofthe alphabet and the numerals as illustrated iii Fig. 3, may be imprinted by any transmitting tape which lis provided with groupings of perforations which' selecty from vthe potentially cyclic recurrent impressions, a predetermined group of impressions.

It Will be observed that With my iin-y ther, a minimum length of receiving tape for a given message` I thus realizea combination of desirable features .vhich has heretofore been striven forvvith but meager success.

Having thus described my invention, Wha

l claim as` new and desire to secure by United States Letters Patent is as follows:

l. An English alphabetfor printing telegraph systems, the characters ofW-hich comprise vertical impressions, and top, medianL and bottom horizontal impressions, the median horizontal impressions when appearing in `contact With the vertical impressions alvvays appearing vvith a median point over a median point of the vertical-impres-- sion.

2. An English alphabet for printing telegraph systemsl the characters of Which Vcomprise vertical impressions and upper, lower and median horizontalV impressions, said.

upper and lower-horizontalimpressions registering at one end with a vertical impression When meeting said vertical impression and the medianlhorizontal impressions al- Ways crossing a vertical impression Whenf.

meeting a vertical impression.

Signed by me at Toronto, county of York, and Province of Ontario, in the presence of tWo Witnesses. i

DAVID S.. HULFISH.

Witnesses WM. J. Hmm/IAN, CHARLEs G.' Asminx,

Genies et this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. CJ 

